Electric-arc lamp



lW. S. HAYS. ELEGTRIG ARG LAMP.

i No. 463,720. Patented Nov. 24, 1891.

IIIIIIIIIIIIIIIIIIIHIII 'pk/ENTER WILL s. HHYS .EY H/.S FITTURNY UNITED STATES PATENT OFFICE.

b IVILLIAM STAFFORD IIAYS, OF TROY, OlIlO.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent N o. 463,720, dated November 24, 189].

Application filed .Inly 27, 1891. Serial No. 400,873- (No model.)

To all whom it may concern.-

Be it known that l, WILLIAM STAFFORD HAYs, a citizen of the United States, and a resident of Troy, county of Miami, and State of Ohio, have invented certain new and useful Improvements in Arc Lamps, of which the following is a specification.

Myinvention relates to the mechanical construction of an electric-arc lamp.

The invention is described accurately by reference to the accompanying drawings, in which- Figure l is an elevation of that part ot the lamp to which the invention relates. Fig. 2 is a vertical section of a portion of the lamp.

The device embodying my invention consists of the combination of a main magnet a of coarse wire, a shunt-magnet b of line wire, both securely attached to the upper plate c, which is connected to the lower plate d by posts e. Each magnet, as shown in Fig. 2, has a tubular non-magnetic axial projection f, in which loosely lits an axial cylindrical armature g, provided with a slotted extension h, to which is pivoted, respectively, the arms 'L' fi of the ring-clutch j, through which passes the carbon-holder m. It will be noticed that the elements f g ht' are in duplicate, the same being provided, respectively, for the magnets ct l). The axes of the magnets a Z) are parallel to and equally distant from that of Vthe carbon-rod holder fm. The axes of the tubes f and armatures g coincide, respectively, with those of the magnets ab. The tubular projection f forms an extension to the tube j' surrounding the core n. To this core is secured a washer o, against which presses the spool end p. The tube f presses against the opposite side of the spool end or insulating-disk p, whereby the latter is held in a fixed position at one end ot' said core. The corresponding disk p is held upon the tube f by a ring q, soldered upon the same and pressing against the disk p. Between the two disks is located a winding of a magnet. An insulating-plate r connects the disks p,which belong, respectively, to the magnets a Z). The holder m passes through said plate and also through the 'plates c and d and the high-resistance coil s, which is wound upon an insulating-tube t, surround* ing the .holder m and fixed to the plate el. Supported on said plate d is a contact u,

which is in circuit with the lamp-terminal 'r and in path of the contactu',\vl1icl1is carried upon an insulatng-projection to, extending from one ol' the slotted extensions h. IVhen the lamp is ready for use, the contacts Lt and a touch each other, as do also the insulatingtube 1f and the ring j, while the cores n are at the maximum distance from the armature g.

Vith no current through the lamp or with carbon consumed the circuit is from the terminal o, through the resistance-coil s, contacts 'Lt ct', and terminal o. IVith carbons in the lamp and with no current the circuit is the same, except that there is also a path from the lamp-terminal o', through the magnet a, the brush x, which rests upon the holder m, through the carbons, and to the lamp-terminal o. If now the current passes through the lamp, it divides between the path of; the carbons and the coil s, the two being branch circuits to each other. The magnet a being of low resistance and properly wound, the armature 7L is attracted sufficiently to interrupt the circuit at the contacts u u. Then all the current will pass through the magnet Ct, raising its armature g to the full height and by means of a clutch 7` separating the carbons and starting the arc. As the arc lengthens more and more, current passes through the shunt-magnet b, attracting its armature g and raising the other side of the clutch j until the carbon-rod is released,which falls until the arc is the normal brilliancy, when the shunt-magnet b weakens, allowing its armature to drop, thus locking the rod m untilthe process is repeated through the formation of the lengthened arc.

,e is a contact located upon plate yr and electrically connected to post o by the conductor z. Therefore when the button A on top of the holder m touches the terminal e', (as it does when the carbons have been consumed,) the coil a is shortfcircuited, its core demagnetized, and armature g released. Contacts u u close the circuit through the resistancecoil s.

I iind in practice that the lamp is free from the diiiiculty known as the rod sticking.

I claim as my inventionl. In an electric-arc lamp, the combination Y of a carbon-holder m, a friction-ring clutch j,

surrounding the same and having oppositely- ICO located arms t' t, main and shunt magnets a, I), whose axes arc parallel to and substantially equally distant from that of the holder m, tubular axial extensions f, of non-magnetic material, projecting from said magnets and forming extensions to the tubes f', upon which the 1nagnet-coils are Wound and within which are located the magnet-cores n, cylindrical armatures g, looselyand axially located in said tubes f and having slotted extensions 72, which are pivoted to the said arms t' fi', respectively, and an insulating-tube t, surrounding the holder m and supporting the ring j.

2. In an electric-arc lamp, the combination of a carbon-holder m, a friction-clutch j, surrounding the same and having oppositely-located arms i', main and shunt magnets a l), whose axes are parallel to and substantially equallydistant from that of the holderm, tubular axial extensions f, of non-magnetic material, projecting from said magnet and forming extensions to the tubes f', upon which the magnet-coils are wound and Within which are located the magnet-cores n, cylindrical armaturesg,looselyand axiallylocated in said tubes j" and having slotted extensions h, which are pivoted to the said arms 'L' t', respectively` an insulating-tube t, surrounding the holder fm, and supporting the ring j, aresistance-,coil s, mounted upon the insulated tube t and in circuit with separable contacts 'a u', one of Which is stationary and the other carried by one of the extensions 7L, and an insulatingplate 9*, connecting the magnet a l) and carrying an electric terminal 5, connected with one of the terminals of the lamp and carrying a brush x, which is electrically connected with the carbon-holder m and with the coil of magnet c.

In testimony that l claim the foregoing as my invention I have signed my name, in presence of two witnesses, this 21st day of July, 1891.

lVILlilAM STAFFORD NAYS.

Witnesses:

W. W. EDGE, J. A. DAVY. 

